1917.] Chapman, Distribution of Bird-life in Colombia. 477 



(3093) Myiarchus tuberculifer nigriceps (Scl). 



Myiarchus nigriceps Scl., P. Z. S., I860, p. 68 (Pallatanga, Ecuador); Wyatt, 

 Ibis, 1871, p. 333 (Ocana to Bucaramanga) ; Allen, Bull. A. M. N. H., XIII, 1900, 

 p. 143 (Minca; Onaca; Las Nubes; Cacagualito; Valparaiso); Hbllm., P. Z. S., 

 1911, p. 1137 (Pueblo Rico, 5200 ft.; Noanamd). 



Without a series of eastern Bolivian birds typical of tuberculifer (Lafr. 

 & d'Orb.) I cannot satisfactorily treat our Colombian series of small, black- 

 headed Flycatchers of the tuberculifer^griceps group. It seems unques- 

 tionable, however, that the bird of which we have forty-five specimens from 

 western Ecuador, western Colombia, Cauca and Magdalena Valleys, Pan- 

 ama, Santa Marta, Buena Vista (above Villavicencio), Merida and north- 

 western Venezuela and Trinidad belongs to a single species. 



The Ecuador specimens are topotypical of nigriceps, while those from 

 Venezuela and Trinidad are referred by Hellmayr ' to tuberculifer. Ac- 

 cepting birds from these localities, therefore, as respectively representing 

 nigriceps and tuberculifer, and aside from slight differences in size, which 

 doubtless would be paralleled in a series of tuberculifer taken from Bolivia 

 to Venezuela, the Trinidad and Venezuela birds (8 specimens) may be 

 distinguished from the Ecuador birds (5 specimens) by having the crown 

 fuscous-black instead of pure black, the back grayish olive-green, instead of 

 olive-green while the crown is less clearly defined from the back; the belly 

 averages paler, but there is here much variation. In the size and shape of 

 the bill, color of the wing-bars, and extent of cinnamon on the inner wing- 

 quills, individual variation is so great that geographical variation, if it exists, 

 is obscured. 



Accepting, then, these two series as standards for comparison, it ap- 

 pears, as might be expected, that specimens from the Pacific Coast of 

 Colombia are typical of nigriceps and a single old skin from the Panama 

 R. R. line is evidently also nigriceps. It is surprising, however, to find 

 the form of the humid Pacific Coast in the Cauca and Magdalena Valleys, 

 but specimens from Call, Rio Frio and below Andalucia unquestionably 

 belong to it. 



Alto Bonito, 2; Dabeiba, 3; Juntas de Tamana, 1; San Jose, 3; Rio 

 Frio, 2; Call, 1; w. slope below Andalucia (alt. 3000 ft.) 3. 



(3093a) Myiarchus tuberculifer tuberculifer {Lafr. & d'Orb.). 



Tyrannus tuberculifer Lapb. & d'Orb., Syn. Av. I, Mag. de Zool., 1837, p. 43 

 (Guarayos, e. Bolivia). 



1 Nov. Zool., XIII, 1906, pp. 26, 323. 



